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SubjectRe: [PATCH v3 5/7] gpio: Add GPIO Aggregator/Repeater driver
Thank you for this series!

> On November 27, 2019 at 9:42 AM Geert Uytterhoeven <geert+renesas@glider.be> wrote:
>
>
> GPIO controllers are exported to userspace using /dev/gpiochip*
> character devices. Access control to these devices is provided by
> standard UNIX file system permissions, on an all-or-nothing basis:
> either a GPIO controller is accessible for a user, or it is not.
> Currently no mechanism exists to control access to individual GPIOs.
>
> Hence add a GPIO driver to aggregate existing GPIOs, and expose them as
> a new gpiochip.
>
> This supports the following use cases:
> 1. Aggregating GPIOs using Sysfs
> This is useful for implementing access control, and assigning a set
> of GPIOs to a specific user or virtual machine.
>
> 2. GPIO Repeater in Device Tree
> This supports modelling e.g. GPIO inverters in DT.
>
> 3. Generic GPIO Driver
> This provides userspace access to a simple GPIO-operated device
> described in DT, cfr. e.g. spidev for SPI-operated devices.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
> v3:
> - Absorb GPIO forwarder,
> - Integrate GPIO Repeater and Generic GPIO driver functionality,
> - Use the aggregator parameters to create a GPIO lookup table instead
> of an array of GPIO descriptors, which allows to simplify the code:
> 1. This removes the need for calling gpio_name_to_desc(),
> gpiochip_find(), gpiochip_get_desc(), and gpiod_request(),
> 2. This allows the platform device to always use
> devm_gpiod_get_index(), regardless of the origin of the GPIOs,
> - Move parameter parsing from platform device probe to sysfs attribute
> store, removing the need for platform data passing,
> - Use more devm_*() functions to simplify cleanup,
> - Add pr_fmt(),
> - General refactoring.
>
> v2:
> - Add missing initialization of i in gpio_virt_agg_probe(),
> - Update for removed .need_valid_mask field and changed
> .init_valid_mask() signature,
> - Drop "virtual", rename to gpio-aggregator,
> - Drop bogus FIXME related to gpiod_set_transitory() expectations,
> - Use new GPIO Forwarder Helper,
> - Lift limit on the maximum number of GPIOs,
> - Improve parsing:
> - add support for specifying GPIOs by line name,
> - add support for specifying GPIO chips by ID,
> - add support for GPIO offset ranges,
> - names and offset specifiers must be separated by whitespace,
> - GPIO offsets must separated by spaces,
> - Use str_has_prefix() and kstrtouint().
> ---
> drivers/gpio/Kconfig | 13 +
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-aggregator.c | 587 +++++++++++++++++++++++++++++++++
> 3 files changed, 601 insertions(+)
> create mode 100644 drivers/gpio/gpio-aggregator.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 8adffd42f8cb0559..36b6b57a6b05e906 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -1507,6 +1507,19 @@ config GPIO_VIPERBOARD
>
> endmenu
>
> +config GPIO_AGGREGATOR
> + tristate "GPIO Aggregator/Repeater"
> + help
> + Say yes here to enable the GPIO Aggregator and repeater, which

Inconsistent capitalization (Aggregator vs. repeater).

> + provides a way to aggregate and/or repeat existing GPIOs into a new
> + GPIO device.
> + This can serve the following purposes:
> + 1. Assign a collection of GPIOs to a user, or export them to a
> + virtual machine,
> + 2. Support GPIOs that are connected to a physical inverter,
> + 3. Provide a generic driver for a GPIO-operated device, to be
> + controlled from userspace using the GPIO chardev interface.
> +
> config GPIO_MOCKUP
> tristate "GPIO Testing Driver"
> select IRQ_SIM
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 34eb8b2b12dd656c..f9971eeb1f32335f 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -25,6 +25,7 @@ obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o
> obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o
> obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
> obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
> +obj-$(CONFIG_GPIO_AGGREGATOR) += gpio-aggregator.o
> obj-$(CONFIG_GPIO_ALTERA_A10SR) += gpio-altera-a10sr.o
> obj-$(CONFIG_GPIO_ALTERA) += gpio-altera.o
> obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
> diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
> new file mode 100644
> index 0000000000000000..873578c6f9683db8
> --- /dev/null
> +++ b/drivers/gpio/gpio-aggregator.c
> @@ -0,0 +1,587 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +// GPIO Aggregator and Repeater
> +//
> +// Copyright (C) 2019 Glider bvba
> +
> +#define DRV_NAME "gpio-aggregator"
> +#define pr_fmt(fmt) DRV_NAME ": " fmt
> +
> +#include <linux/bitmap.h>
> +#include <linux/bitops.h>
> +#include <linux/ctype.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/gpio/machine.h>
> +#include <linux/idr.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/overflow.h>
> +#include <linux/platform_device.h>
> +#include <linux/spinlock.h>
> +#include <linux/string.h>
> +
> +#include "gpiolib.h"
> +
> +
> + /*
> + * GPIO Aggregator sysfs interface
> + */

Should this comment really be indented?

> +
> +struct gpio_aggregator {
> + struct gpiod_lookup_table *lookups;
> + struct platform_device *pdev;
> + char args[];
> +};
> +
> +static DEFINE_MUTEX(gpio_aggregator_lock); /* protects idr */
> +static DEFINE_IDR(gpio_aggregator_idr);
> +
> +static char *get_arg(char **args)
> +{
> + char *start = *args, *end;
> +
> + while (isspace(*start))
> + start++;

"start = skip_spaces(start);", perhaps. (Looking at a grep through drivers/, I would say usage of while(isspace(...))... vs. skip_spaces() is about 60/40.)

> +
> + if (!*start)
> + return NULL;
> +
> + if (*start == '"') {
> + /* Quoted arg */
> + end = strchr(++start, '"');
> + if (!end)
> + return ERR_PTR(-EINVAL);
> + } else {
> + /* Unquoted arg */
> + for (end = start; *end && !isspace(*end); end++) ;
> + }
> +
> + if (*end)
> + *end++ = '\0';
> +
> + *args = end;
> + return start;
> +}
> +
> +static bool isrange(const char *s)
> +{
> + size_t n = strlen(s);
> +
> + if (IS_ERR_OR_NULL(s))
> + return false;
> +
> + while (1) {
> + n = strspn(s, "0123456789");
> + if (!n)
> + return false;
> +
> + s += n;
> +
> + switch (*s++) {
> + case '\0':
> + return true;
> +
> + case '-':
> + case ',':
> + break;
> +
> + default:
> + return false;
> + }
> + }
> +}
> +
> +static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *label,
> + int hwnum, unsigned int *n)
> +{
> + struct gpiod_lookup_table *lookups;
> +
> + lookups = krealloc(aggr->lookups, struct_size(lookups, table, *n + 2),
> + GFP_KERNEL);
> + if (!lookups)
> + return -ENOMEM;
> +
> + lookups->table[*n].chip_label = label;
> + lookups->table[*n].chip_hwnum = hwnum;
> + lookups->table[*n].idx = *n;
> +
> + (*n)++;
> + memset(&lookups->table[*n], 0, sizeof(lookups->table[*n]));
> +
> + aggr->lookups = lookups;
> + return 0;
> +}
> +
> +static int aggr_parse(struct gpio_aggregator *aggr)
> +{
> + char *name, *offsets, *first, *last, *next;
> + unsigned int a, b, i, n = 0;

Too many single-letter variables. "first_index" and "last_index" instead of "a" and "b" would make it easier to understand.

> + char *args = aggr->args;
> + int error;
> +
> + for (name = get_arg(&args), offsets = get_arg(&args); name;
> + offsets = get_arg(&args)) {
> + if (IS_ERR(name)) {
> + pr_err("Cannot get GPIO specifier: %ld\n",
> + PTR_ERR(name));
> + return PTR_ERR(name);
> + }
> +
> + if (!isrange(offsets)) {
> + /* Named GPIO line */
> + error = aggr_add_gpio(aggr, name, -1, &n);

The "-1" magic could use a #define, IMO.

> + if (error)
> + return error;
> +
> + name = offsets;
> + continue;
> + }
> +
> + /* GPIO chip + offset(s) */
> + for (first = offsets; *first; first = next) {
> + next = strchrnul(first, ',');
> + if (*next)
> + *next++ = '\0';
> +
> + last = strchr(first, '-');
> + if (last)
> + *last++ = '\0';
> +
> + if (kstrtouint(first, 10, &a)) {
> + pr_err("Cannot parse GPIO index %s\n", first);
> + return -EINVAL;
> + }
> +
> + if (!last) {
> + b = a;
> + } else if (kstrtouint(last, 10, &b)) {
> + pr_err("Cannot parse GPIO index %s\n", last);
> + return -EINVAL;
> + }
> +
> + for (i = a; i <= b; i++) {
> + error = aggr_add_gpio(aggr, name, i, &n);
> + if (error)
> + return error;
> + }
> + }
> +
> + name = get_arg(&args);
> + }
> +
> + if (!n) {
> + pr_err("No GPIOs specified\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static ssize_t new_device_store(struct device_driver *driver, const char *buf,
> + size_t count)
> +{
> + struct gpio_aggregator *aggr;
> + struct platform_device *pdev;
> + int res, id;
> +
> + /* kernfs guarantees string termination, so count + 1 is safe */
> + aggr = kzalloc(sizeof(*aggr) + count + 1, GFP_KERNEL);
> + if (!aggr)
> + return -ENOMEM;
> +
> + memcpy(aggr->args, buf, count + 1);
> +
> + aggr->lookups = kzalloc(struct_size(aggr->lookups, table, 1),
> + GFP_KERNEL);
> + if (!aggr->lookups) {
> + res = -ENOMEM;
> + goto free_ga;
> + }
> +
> + mutex_lock(&gpio_aggregator_lock);
> + id = idr_alloc(&gpio_aggregator_idr, aggr, 0, 0, GFP_KERNEL);
> + mutex_unlock(&gpio_aggregator_lock);
> +
> + if (id < 0) {
> + res = id;
> + goto free_table;
> + }
> +
> + aggr->lookups->dev_id = kasprintf(GFP_KERNEL, "%s.%d", DRV_NAME, id);
> + if (!aggr->lookups) {
> + res = -ENOMEM;
> + goto remove_idr;
> + }
> +
> + res = aggr_parse(aggr);
> + if (res)
> + goto free_dev_id;
> +
> + gpiod_add_lookup_table(aggr->lookups);
> +
> + pdev = platform_device_register_simple(DRV_NAME, id, NULL, 0);
> + if (IS_ERR(pdev)) {
> + res = PTR_ERR(pdev);
> + goto remove_table;
> + }
> +
> + aggr->pdev = pdev;
> + return count;
> +
> +remove_table:
> + gpiod_remove_lookup_table(aggr->lookups);
> +free_dev_id:
> + kfree(aggr->lookups->dev_id);
> +remove_idr:
> + mutex_lock(&gpio_aggregator_lock);
> + idr_remove(&gpio_aggregator_idr, id);
> + mutex_unlock(&gpio_aggregator_lock);
> +free_table:
> + kfree(aggr->lookups);
> +free_ga:
> + kfree(aggr);
> + return res;
> +}
> +
> +static DRIVER_ATTR_WO(new_device);
> +
> +static void gpio_aggregator_free(struct gpio_aggregator *aggr)
> +{
> + platform_device_unregister(aggr->pdev);
> + gpiod_remove_lookup_table(aggr->lookups);
> + kfree(aggr->lookups->dev_id);
> + kfree(aggr->lookups);
> + kfree(aggr);
> +}
> +
> +static ssize_t delete_device_store(struct device_driver *driver,
> + const char *buf, size_t count)
> +{
> + struct gpio_aggregator *aggr;
> + unsigned int id;
> + int error;
> +
> + if (!str_has_prefix(buf, DRV_NAME "."))
> + return -EINVAL;
> +
> + error = kstrtouint(buf + strlen(DRV_NAME "."), 10, &id);
> + if (error)
> + return error;
> +
> + mutex_lock(&gpio_aggregator_lock);
> + aggr = idr_remove(&gpio_aggregator_idr, id);
> + mutex_unlock(&gpio_aggregator_lock);
> + if (!aggr)
> + return -ENOENT;
> +
> + gpio_aggregator_free(aggr);
> + return count;
> +}
> +static DRIVER_ATTR_WO(delete_device);
> +
> +static struct attribute *gpio_aggregator_attrs[] = {
> + &driver_attr_new_device.attr,
> + &driver_attr_delete_device.attr,
> + NULL,
> +};
> +ATTRIBUTE_GROUPS(gpio_aggregator);
> +
> +static int __exit gpio_aggregator_idr_remove(int id, void *p, void *data)
> +{
> + gpio_aggregator_free(p);
> + return 0;
> +}
> +
> +static void __exit gpio_aggregator_remove_all(void)
> +{
> + mutex_lock(&gpio_aggregator_lock);
> + idr_for_each(&gpio_aggregator_idr, gpio_aggregator_idr_remove, NULL);
> + idr_destroy(&gpio_aggregator_idr);
> + mutex_unlock(&gpio_aggregator_lock);
> +}
> +
> +
> + /*
> + * Common GPIO Forwarder
> + */
> +
> +struct gpiochip_fwd {
> + struct gpio_chip chip;
> + struct gpio_desc **descs;
> + union {
> + struct mutex mlock; /* protects tmp[] if can_sleep */
> + spinlock_t slock; /* protects tmp[] if !can_sleep */
> + };
> + unsigned long tmp[]; /* values and descs for multiple ops */
> +};
> +
> +static int gpio_fwd_get_direction(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +
> + return gpiod_get_direction(fwd->descs[offset]);
> +}
> +
> +static int gpio_fwd_direction_input(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +
> + return gpiod_direction_input(fwd->descs[offset]);
> +}
> +
> +static int gpio_fwd_direction_output(struct gpio_chip *chip,
> + unsigned int offset, int value)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +
> + return gpiod_direction_output(fwd->descs[offset], value);
> +}
> +
> +static int gpio_fwd_get(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +
> + return gpiod_get_value(fwd->descs[offset]);
> +}
> +
> +static int gpio_fwd_get_multiple(struct gpio_chip *chip, unsigned long *mask,
> + unsigned long *bits)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> + unsigned long *values, flags;
> + struct gpio_desc **descs;
> + unsigned int i, j = 0;
> + int error;
> +
> + if (chip->can_sleep)
> + mutex_lock(&fwd->mlock);
> + else
> + spin_lock_irqsave(&fwd->slock, flags);
> +
> + values = &fwd->tmp[0];
> + bitmap_clear(values, 0, fwd->chip.ngpio);
> + descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)];

This use of the tmp array, which I presume serves to avoid extra memory allocations at the time of device creation, is odd enough to deserve a comment.

> +
> + for_each_set_bit(i, mask, fwd->chip.ngpio)
> + descs[j++] = fwd->descs[i];
> +
> + error = gpiod_get_array_value(j, descs, NULL, values);
> + if (!error) {
> + j = 0;
> + for_each_set_bit(i, mask, fwd->chip.ngpio)
> + __assign_bit(i, bits, test_bit(j++, values));
> + }
> +
> + if (chip->can_sleep)
> + mutex_unlock(&fwd->mlock);
> + else
> + spin_unlock_irqrestore(&fwd->slock, flags);
> +
> + return error;
> +}
> +
> +static void gpio_fwd_set(struct gpio_chip *chip, unsigned int offset, int value)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +
> + gpiod_set_value(fwd->descs[offset], value);
> +}
> +
> +static void gpio_fwd_set_multiple(struct gpio_chip *chip, unsigned long *mask,
> + unsigned long *bits)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> + unsigned long *values, flags;
> + struct gpio_desc **descs;
> + unsigned int i, j = 0;
> +
> + if (chip->can_sleep)
> + mutex_lock(&fwd->mlock);
> + else
> + spin_lock_irqsave(&fwd->slock, flags);
> +
> + values = &fwd->tmp[0];
> + descs = (void *)&fwd->tmp[BITS_TO_LONGS(fwd->chip.ngpio)];
> +
> + for_each_set_bit(i, mask, fwd->chip.ngpio) {
> + __assign_bit(j, values, test_bit(i, bits));
> + descs[j++] = fwd->descs[i];
> + }
> +
> + gpiod_set_array_value(j, descs, NULL, values);
> +
> + if (chip->can_sleep)
> + mutex_unlock(&fwd->mlock);
> + else
> + spin_unlock_irqrestore(&fwd->slock, flags);
> +}
> +
> +static int gpio_fwd_set_config(struct gpio_chip *chip, unsigned int offset,
> + unsigned long config)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> +
> + chip = fwd->descs[offset]->gdev->chip;
> + if (chip->set_config)
> + return chip->set_config(chip, offset, config);
> +
> + return -ENOTSUPP;
> +}
> +
> +static int gpio_fwd_init_valid_mask(struct gpio_chip *chip,
> + unsigned long *valid_mask,
> + unsigned int ngpios)
> +{
> + struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
> + unsigned int i;
> +
> + for (i = 0; i < ngpios; i++) {
> + if (!gpiochip_line_is_valid(fwd->descs[i]->gdev->chip,
> + gpio_chip_hwgpio(fwd->descs[i])))
> + clear_bit(i, valid_mask);
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * gpiochip_fwd_create() - Create a new GPIO forwarder
> + * @dev: Parent device pointer
> + * @ngpios: Number of GPIOs in the forwarder.
> + * @descs: Array containing the GPIO descriptors to forward to.
> + * This array must contain @ngpios entries, and must not be deallocated
> + * before the forwarder has been destroyed again.
> + *
> + * This function creates a new gpiochip, which forwards all GPIO operations to
> + * the passed GPIO descriptors.
> + *
> + * Return: An opaque object pointer, or an ERR_PTR()-encoded negative error
> + * code on failure.
> + */
> +static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
> + unsigned int ngpios,
> + struct gpio_desc *descs[])
> +{
> + const char *label = dev_name(dev);
> + struct gpiochip_fwd *fwd;
> + struct gpio_chip *chip;
> + unsigned int i;
> + int error;
> +
> + fwd = devm_kzalloc(dev, struct_size(fwd, tmp,
> + BITS_TO_LONGS(ngpios) + ngpios), GFP_KERNEL);
> + if (!fwd)
> + return ERR_PTR(-ENOMEM);
> +
> + chip = &fwd->chip;
> +
> + for (i = 0; i < ngpios; i++) {
> + dev_dbg(dev, "gpio %u => gpio-%d (%s)\n", i,
> + desc_to_gpio(descs[i]), descs[i]->label ? : "?");
> +
> + if (gpiod_cansleep(descs[i]))
> + chip->can_sleep = true;
> + if (descs[i]->gdev->chip->set_config)
> + chip->set_config = gpio_fwd_set_config;
> + if (descs[i]->gdev->chip->init_valid_mask)
> + chip->init_valid_mask = gpio_fwd_init_valid_mask;
> + }
> +
> + chip->label = label;
> + chip->parent = dev;
> + chip->owner = THIS_MODULE;
> + chip->get_direction = gpio_fwd_get_direction;
> + chip->direction_input = gpio_fwd_direction_input;
> + chip->direction_output = gpio_fwd_direction_output;
> + chip->get = gpio_fwd_get;
> + chip->get_multiple = gpio_fwd_get_multiple;
> + chip->set = gpio_fwd_set;
> + chip->set_multiple = gpio_fwd_set_multiple;
> + chip->base = -1;
> + chip->ngpio = ngpios;
> + fwd->descs = descs;
> +
> + if (chip->can_sleep)
> + mutex_init(&fwd->mlock);
> + else
> + spin_lock_init(&fwd->slock);
> +
> + error = devm_gpiochip_add_data(dev, chip, fwd);
> + if (error)
> + return ERR_PTR(error);
> +
> + return fwd;
> +}
> +
> +
> + /*
> + * Common GPIO Aggregator/Repeater platform device
> + */
> +
> +static int gpio_aggregator_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct gpio_desc **descs;
> + struct gpiochip_fwd *fwd;
> + int i, n;
> +
> + n = gpiod_count(dev, NULL);
> + if (n < 0)
> + return n;
> +
> + descs = devm_kmalloc_array(dev, n, sizeof(*descs), GFP_KERNEL);
> + if (!descs)
> + return -ENOMEM;
> +
> + for (i = 0; i < n; i++) {
> + descs[i] = devm_gpiod_get_index(dev, NULL, i, GPIOD_ASIS);
> + if (IS_ERR(descs[i]))
> + return PTR_ERR(descs[i]);
> + }
> +
> + fwd = gpiochip_fwd_create(dev, n, descs);
> + if (IS_ERR(fwd))
> + return PTR_ERR(fwd);
> +
> + platform_set_drvdata(pdev, fwd);
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id gpio_aggregator_dt_ids[] = {
> + { .compatible = "gpio-repeater" },
> + /*
> + * Add GPIO-operated devices controlled from userspace below,
> + * or use "driver_override" in sysfs
> + */
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, gpio_aggregator_dt_ids);
> +#endif
> +
> +static struct platform_driver gpio_aggregator_driver = {
> + .probe = gpio_aggregator_probe,
> + .driver = {
> + .name = DRV_NAME,
> + .groups = gpio_aggregator_groups,
> + .of_match_table = of_match_ptr(gpio_aggregator_dt_ids),
> + },
> +};
> +
> +static int __init gpio_aggregator_init(void)
> +{
> + return platform_driver_register(&gpio_aggregator_driver);
> +}
> +module_init(gpio_aggregator_init);
> +
> +static void __exit gpio_aggregator_exit(void)
> +{
> + gpio_aggregator_remove_all();
> + platform_driver_unregister(&gpio_aggregator_driver);
> +}
> +module_exit(gpio_aggregator_exit);
> +
> +MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
> +MODULE_DESCRIPTION("GPIO Aggregator/Repeater");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.1
>

CU
Uli

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